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Researchers say a new fuel, based on whisky, could reduce demand for oil. They say using less oil could cut pollution that studies have linked to climate change. Scotland is the largest producer of whisky in the world. And a Scottish professor has found how to take the byproducts from distilling whisky and turn them into a form of alcohol called biobutanol. This product can be used as fuel. Whisky comes from grain, such as corn, rye or wheat. First, the liquid is purified. It is heated until it becomes a gas. The gas is then cooled, and the resulting liquid collected. Martin Tangney is director of the Biofuel Research Centre at Napier University in Edinburgh. He says less than 10 percent of the product can be considered whisky. The rest is mainly one of two unwanted byproducts: pot ale and barley. Tangney says the two byproducts can be combined to create a new material: biobutanol. He says the whisky-based biofuel provides more power than bioethanol, a fuel made from plants like corn or sugar cane. And it has almost the same amount of energy as the gasoline used to power automobiles. He says that automobile engines do not need to be changed for biobutanol to work. Tangney does not expect biobutanol to replace gasoline, but he thinks the two fuels can be mixed together. He says it is possible the fuel may also be used in airplanes, ships and in heaters.